[Bug 1907716] [NEW] :ppa keep coming back / unable to upgrade 18.04 > 20.04

[neo]

Public bug reported:

Hello ,

i have tried to upgrade my Ubuntu System from 18.04 to 20.04.

having problems deactivating the PPA that i have installed manually as
requested by the upgrade process manager > however i try to do it, after
a reboot, they are back.

ppa: skype and ppa:deadsnakes

tried deleting the manually (in "Software & Updates" >> "Other Software")
and via "ppa-purge" .

everytime it seems clean, i reboot, restart the upgrade the process (via
"Software Updater")

then after some short time update fails with


error : could not calculate the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-56.62~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Dec 10 22:19:24 2020
InstallationDate: Installed on 2020-11-28 (12 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-10 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1907716

Title:
  :ppa keep coming back / unable to upgrade 18.04 > 20.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Hello ,

  i have tried to upgrade my Ubuntu System from 18.04 to 20.04.

  having problems deactivating the PPA that i have installed manually as
  requested by the upgrade process manager > however i try to do it,
  after a reboot, they are back.

  ppa: skype and ppa:deadsnakes

  tried deleting the manually (in "Software & Updates" >> "Other Software")
  and via "ppa-purge" .

  everytime it seems clean, i reboot, restart the upgrade the process
  (via "Software Updater")

  then after some short time update fails with

  
  error : could not calculate the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 5.4.0-56.62~18.04.1-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec 10 22:19:24 2020
  InstallationDate: Installed on 2020-11-28 (12 days ago)
  InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-10 (0 days ago)
  VarLogDistupgradeTermlog:

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